Measurement of the top quark Yukawa coupling from t(t)over-bar kinematic distributions in the dilepton final state in proton-proton collisions at root s=13 TeV

A measurement of the Higgs boson Yukawa coupling to the top quark is presented using proton-proton collision data at (\sqrt{s}=13\text{}\text{}\mathrm{TeV}), corresponding to an integrated luminosity of (137\text{}\text{}{\mathrm{fb}}^{-1}), recorded with the CMS detector. The coupling strength with respect to the standard model value, ({Y}{t}), is determined from kinematic distributions in (t\overline{t}) final states containing (ee), (\mu \mu ), or (e\mu ) pairs. Variations of the Yukawa coupling strength lead to modified distributions for (t\overline{t}) production. In particular, the distributions of the mass of the (t\overline{t}) system and the rapidity difference of the top quark and antiquark are sensitive to the value of ({Y}{t}). The measurement yields a best fit value of ({{Y}{t}=1.16}{-0.35}^{+0.24}), bounding ({Y}_{t}<1.54) at a 95% confidence level.